我刚刚下载并安装了新的Android SDK。我想创建一个简单的应用程序来测试它。
向导创建了以下代码:
package eu.mauriziopz.gps;
import android.app.Activity;
import android.os.Bundle;
public class ggps extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
但是Eclipse给出了错误
R不能被分解
在网上
setContentView(R.layout.main);
Why?
PS:我在res/layout/下有一个名为main.xml的XML文件。
当前回答
我遇到了同样的问题，但找不到哪个xml文件导致了错误。
多亏了这篇文章，我安装了18.1.1而不是19的构建工具，它显示了有缺陷的文件。看起来版本19并没有显示实际的错误。
希望它能帮助到一些人:-)
其他回答
按Alt+enter并导入
or
Ctrl + F9
和解决。
只需进入Android Top菜单列表。点击构建菜单，在构建下点击重建项目。
在我的情况下，R.java没有生成，因为在AndroidManifest.xml文件中有一个问题，其中我错误地指定了一个活动的名称!
我用窗口->首选项->Android和SDK解决了这个问题，位置:adt\ SDK的路径，例如C:\adt\ SDK
So I have run into this problem multiple times when switching build targets. Usually doing a Project >> Clean worked for me. This last time, however, it did not. Finally I tried to open my default.properties file, located under the root project folder. I received an error message stating that it was out of sync with the file system. I actually deleted it and copied a coworkers version which allowed eclipse to rebuild my R file. I will paste what it looks like below. It is named 'default.properties'.
# This file is automatically generated by Android Tools.
# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
#
# This file must be checked in Version Control Systems.
#
# To customize properties used by the Ant build system use,
# "build.properties", and override values to adapt the script to your
# project structure.
# Indicates whether an apk should be generated for each density.
split.density=false
# Project target.
target=android-3
